Appendix D. HCD object management services

The HCD object management services (HOM) provide an application programming interface for retrieving data from the IODF, such as switch data, device type, or control unit type. The programs requesting the services cannot run in APF-authorized state.

The mapping macros CBDZHRB, CBDZHIEX, CBDZHOEX, and CBDZHCEX (see Data input and output areas and Request block (HRB)) are not available as source code. The macros are listed in MVS Data Areas Volume 1 available from the z/OS Internet Library, and must be coded by the application writer.